If it is BIOS, do not install that card. A UEFI card will not operate in a BIOS boot environment.

The DC7700 was released in the Fall of 2006.

SIDEBAR<> DC7700 PCIE slot MAX 25W. R5 240 is a 30W card. So, it is also a NO vote.

Curious<> Where did you get this 12 year old machine ?

This system is feedback driven thru Solution and Kudo flags. It's the only means of knowing if you have been served. Please click Accept as Solution, if your problem is solved. To say THANK YOU, press the "thumbs up symbol" to render a KUDO. You can render both Solution and KUDO..

Can DC7700 SFF run AMD Radeon R5 240 1GB DDR3 Dell F9P1R

I did take notice you gave a Kudo, and that, in these trying times, is MUCH appreciated !!!!!

This system is feedback driven thru Solution and Kudo flags. It's the only means of knowing if you have been served. Please click Accept as Solution, if your problem is solved. To say THANK YOU, press the "thumbs up symbol" to render a KUDO. You can render both Solution and KUDO..

Can DC7700 SFF run AMD Radeon R5 240 1GB DDR3 Dell F9P1R

You can use google and type in, with out the quotes, example "HD 7570 release date".

Anything after Augist 2012 is likely UEFI.

I see you have Legacy....that is BIOS.

This system is feedback driven thru Solution and Kudo flags. It's the only means of knowing if you have been served. Please click Accept as Solution, if your problem is solved. To say THANK YOU, press the "thumbs up symbol" to render a KUDO. You can render both Solution and KUDO..